Yuuki Rito is an average high-school student: awkward, shy, and hopeless when it comes to confessing his feelings to the girl of his dreams. But one day, a beautiful woman suddenly materializes in his bathtub--an alien princess on the run from an intergalactic empire. After Rito gets unwittingly engaged to Lala, he soon finds himself sucked into a battle for her affections.ions.

As Rito's heart continues to waver between Lala and his first crush, Momo finds herself unable to deny the feelings she has for the hapless earthling high schooler. Could a human alien harem be the solution to all their problems?

In this sequel series to To Love Ru, Princess Lala's younger sister begins her own marital machinations to ensnare a poor boy. But to make her plan a reality, he has to become king of their interstellar empire, which would allow him to marry as many women as he wants!